Barking drum



April 18, 1933. J. STRINDLUND BARKING DRUM I 2 Sheets-Sheet 1 Filed July 21. 1951 April 18, 1933. J. STRINDLUND 1,904,937

BARKING' DRUM Filed July 21, 1931 2 Sheets-Sheet 2 Even/07" ryffarney.

Patented Apr. 18, 1933 JOHN sprain-Drown, 'or'momn r'nrrnumt, wo awair lmazar isam Application mafiui 'zi 1931, seiiai nb. 552,09I2 ,and in" Sweden my 2%; 1930. I i

The present invention relates to an improvement in barking drums of the type which consist of several substantially' hori 5 zontal V rotary-drum sections arranged e'nd toend; i

It is well known that i ngba'rking dru the barking action is prin'cipall'y' r d d by friction between the logs, and since the strength of the bark is reducedwhen soaked 0 with water, it is customary to carry out the barking operation in the presence of water."

The barking operation takes place the cash- 1", the wetter the bark is, and it will of "course also be effected the speedier and better the greater the pressure between the logs is;

The present invention has for its pur pose to render it possible tofill the barking drums to a higher levelthanfhitherto pose ible, whereby several advantages areat tained amongst which arethat the wood is given more time in the barking drum and" thus becomes better soaked with water, and

that owing to the increased. pressuregthe bark is j more easily ground to pieces and; thus more easily removed, which two ad:

vantages render it possible to drivethe barking drum at a lower speed Whereby the H V v tlons 2 and 3 are referenced 12 and 13, 'reconsumption of powe'ris reduced.

The invention consists principally in that the drum sections, taken in the; direction from the inletend ofthe drum, lie' with their axes higher than the axes of'the" following drum sections or with their axes displ'aced to that side of the vertical plane through of a barking drum the sections of whichhave equal diameters, and'Fig. 2 is a diagrammatical end vieW of the drum. Fig. 3 shows a longitudinal section of a barking drum the sections of which have unequal :diameters, and Fig. 4 is a diagrammatical end view of said drum.

its axis higher than; the laxisflA2 of the section 2,' and 5' also has itsaxis A1 displaced to the left of 'thegvertical plane- 1 through the axis A2 of ,thesection 2, that i is'to say on that side'of the vertical plane 6 ."As shown inFi g; 2, thefsection 1 lies with through said'axis A2011 which side the 'cir cumferences of the sections move; down- Wards, -as indicated by the arrow 10. In similar manner the section 2ilies with its axisA2 higher than. and tothe left of the axis A3 of the section-3.: The varioussec- V tions are supported by chains 8 running over chain wheels 6 'onfshafts *7 and are also 'supported attheir ascending sides by' supporting rollers'9.

"As is Well: known, a'horizontal rotary? I barking drum can be filled with logs i -up to a certain level or surface whichfis inclined during the rotation. -Saidd'evel 0r slanting surface up to which the section-l may bevfilled, is referenced 11 in Fig. 2,-and

the corresponding levels or surfaces in secspectivelyf-According to the presentin-Q ventlon-t'hebarking drum may thus be operatedwith the sectionsfilled up to; these v highest 'levels'onslanting surfaces11-,'12

and 13, whereby the advantages above stated are attained, and simultaneously such slope is. obtained in the longitudinal direotion ofthe barking drum of theinclined upper surface of the woochwhich surface is denoted by "said linesll, [12; and 13; that ,the logs are'givena high speed of-motion in i the axial direction through the barking drum, which isnecessary in drums of great of logs from one section to another. The

' first section. "are prevented from getting jammed bedrum sections are provided at their adjacent ends with exterior flanges which are arranged in such manner, as shown in Fig. 1, that the flange on one section covers that portion of the end opening of the adjacent section which is not covered by. the By this arrangement the logs tween the various sect1ons.

The same result, thoughina'somewhat.

less degree, can obviously be obtained by locating the axis of each section to the left, as viewed in Fig. 2, of the axis of the following section', as shown "in respect of sections 3' and 4 wherethe axis A3 of section 3 is located to the left of the axis A4, of section 4,, since also with this arrangement the filling line or surface 13 of the preceding section 3; will come higher than the filling 'line or surface 14 of the tollow-ingsection 4.

In order to obtaina sufficient outlet opening over the wall16 it'is suitable to place oneor-mre of the last section of the series,

section in Figs. 1 and 2, higher than the preceding: section 4, and preferably also somewhat tothe left of the same, as shown.

in Fig. 2 where A5 is the axis of section 5. The barking drum illustrated in Figs. 3.

and 4 differs from the one abovev described.

and illustrated in Figs. 1 and 2 only in so far that the sections 21 and 22 at the inlet end andthe section 25 at thev outlet end have largerdiameters than the middle'sections 23 and 24. Lines 31, 32, 33, and 34 in. Fig.v

'tion having entirely open and unconstricted ends, the section nearest the inlet end of .apair of adjacent drum sections having its axis located higher than the axis of the other of said drum sections in the'dlrection perpendicular to the slanting level formed by the rolling wood in the drum when r0.- tated. a

2.. In a barking drum having an inlet end and an outlet end, the combination of several substantially. horizontal rotary drum sections arranged end to end, each drum section. having entirely open and unconstricted ends, the section nearest the inlet. end of a pair of adjacent drum sections having its axis located higher in the vertical direction than the axis of the other of said drum sections.

3. In a barking drum having an inlet end and, an outlet end, the combination of severalsubstantiallyhorizontal rotary drum sections arranged end to end, the section nearest the inlet end of a pair of adjacent drum sections having its axis located higher in the vertical direction than the axis ofthe other of said drum sections and also displaced to that side of the vertical plane through the axis of said other drum, section on which side. the circumferences of the drum sections move downwards. I 7

4. In a barking drum having an inlet end and outlet end, the combination of several substantially horizontal rotary drum sections arranged end to end, the section nearest, the inlet end of a pair of'adjacent drum sections having its axis located higher than the axis 0t the other of said drum sections in the direction erpe ndicular to the slanting" level formed in the drum when rotated, andia drum section at the discharge end of the drum having its axis located higherthan the axis of the preceding drum section.

5.. In. a barking drum having an inlet. end and, an. outlet end, the combination of sev eral substantially horizontalrotary drum sections arranged end to end, thev section nearest the inlet end of. a pair of adjacent drum sections having its. axis located higher than the axis of the other of said drumsections in. the direction perpendicular to the slanting level formed by the rolling'wood in the. drum when rotated, said drumsections being provided at their adjacent ends with exterior flanges adapted .tocover such portion of. the, end opening of one section as is not covered by the adjacent section.

6.. In abarking drum having'an inlet end andv an outlet end, the combination of several y the rolling wood substantially horizontal rotary drum sec--v tions arranged end. to. end, the. section nearest.- the inlet. end of. a pair of adjacent drum sections having its, axis. located higher in the vertical direction than the axis of the other of said drum sections, said drum sections. being provided at their adjacent ends 'with exterior flanges adapted, to coversuch portion: of the end opening or one section as is notcovered by the adjacent section.

JQHN STRINDLUND. 

